我正在尝试在具有两行的表上执行 PIVOT,如下所示:
Category | Sector
---------------------------
Bulbs | DIY
Bulbs | Home
Picnic blanket | DIY
Picnic blanket | Home
Picnic blanket | Interior
每个类别可以有 1 个或多个扇区。
我正在尝试获得这样的表格:
Category | Sector 1 | Sector 2 | Sector 3
-------------------------------------------------
Bulbs | DIY | Home | NULL
Picnic blanket | DIY | Home | Interior
查询看起来像这样:
SELECT
dbo.fn_DbContent_GetTranslation(pt.Name_DbContentId, 2) 'Category'
, dbo.fn_DbContent_GetTranslation(s.Name_DbContentId, 2) 'Sector'
FROM dbo.ProductType pt
JOIN dbo.ProductTypeMandator ptm ON ptm.ProductTypeId = pt.Id
JOIN dbo.ProductTypeMandator2PortalSector ptmps ON ptmps.ProductTypeMandatorId = ptm.Id
JOIN dbo.PortalSector ps ON ps.Id = ptmps.PortalSectorId
JOIN dbo.Sector s ON s.Id = ps.SectorId
WHERE
ptmps.PortalSectorId IN (21, 18, 19)
我已经做了一个 PIVOT,但是有一个包含三列的表,其中一列包含数据透视表中标题的值。在这种情况下,标题的值丢失了,所以我不知道该怎么做。
感谢帮助
最佳答案
你可以这样解决:
-- Create demo data
CREATE TABLE #cats(category nvarchar(25), sector nvarchar(25))
INSERT INTO #cats(category, sector)
VALUES (N'Bulbs',N'DIY'),
(N'Bulbs',N'Home'),
(N'Picnic blanket',N'DIY'),
(N'Picnic blanket',N'Home'),
(N'Picnic blanket',N'Interior')
SELECT *
FROM (
SELECT category, sector
FROM #cats
) as dat
PIVOT(
MAX(sector)
FOR sector IN([DIY],[Home],[Interior])
) as pvt
-- Cleanup
DROP TABLE #cats
如果您希望它像示例中一样正确命名,您可以将它与命名编号结合使用:
-- Create demo data
CREATE TABLE #cats(category nvarchar(25), sector nvarchar(25))
INSERT INTO #cats(category, sector)
VALUES (N'Bulbs',N'DIY'),
(N'Bulbs',N'Home'),
(N'Picnic blanket',N'DIY'),
(N'Picnic blanket',N'Home'),
(N'Picnic blanket',N'Interior')
SELECT *
FROM (
SELECT category, sector, N'Sector '+CONVERT(nvarchar(max),DENSE_RANK() OVER(ORDER BY sector)) as rn
FROM #cats
) as dat
PIVOT(
MAX(sector)
FOR rn IN([Sector 1],[Sector 2],[Sector 3])
) as pvt
-- Cleanup
DROP TABLE #cats
最后但同样重要的是,如果您希望它是动态的:
-- Create demo data
CREATE TABLE #cats(category nvarchar(25), sector nvarchar(25))
INSERT INTO #cats(category, sector)
VALUES (N'Bulbs',N'DIY'),
(N'Bulbs',N'Home'),
(N'Picnic blanket',N'DIY'),
(N'Picnic blanket',N'Home'),
(N'Picnic blanket',N'Interior')
DECLARE @sql nvarchar(max), @cols nvarchar(max)
-- get proper column list
SELECT @cols = COALESCE(@cols + N',[' + grCols.rn + N']',N'[' + grCols.rn + N']')
FROM (
SELECT DISTINCT N'Sector '+CONVERT(nvarchar(max),DENSE_RANK() OVER(ORDER BY sector)) as rn
FROM #cats
) as grCols
SET @sql = N'
SELECT *
FROM (
SELECT category, sector, N''Sector ''+CONVERT(nvarchar(max),DENSE_RANK() OVER(ORDER BY sector)) as rn
FROM #cats
) as dat
PIVOT(
MAX(sector)
FOR rn IN('+@cols+')
) as pvt'
EXEC(@sql)
-- Cleanup
DROP TABLE #cats
关于只有两列的 SQL Pivot,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31378740/